EP2908306A1 - Mobile-display cover glass and method for manufacturing same - Google Patents
Mobile-display cover glass and method for manufacturing same Download PDFInfo
- Publication number
- EP2908306A1 EP2908306A1 EP13846184.3A EP13846184A EP2908306A1 EP 2908306 A1 EP2908306 A1 EP 2908306A1 EP 13846184 A EP13846184 A EP 13846184A EP 2908306 A1 EP2908306 A1 EP 2908306A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mobile
- cover glass
- display
- display cover
- corner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
- C03B23/0307—Press-bending involving applying local or additional heating, cooling or insulating means
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/025—Re-forming glass sheets by bending by gravity
- C03B23/0256—Gravity bending accelerated by applying mechanical forces, e.g. inertia, weights or local forces
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/025—Re-forming glass sheets by bending by gravity
- C03B23/0258—Gravity bending involving applying local or additional heating, cooling or insulating means
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
- C03B23/0305—Press-bending accelerated by applying mechanical forces, e.g. inertia, weights or local forces
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3827—Portable transceivers
- H04B1/3888—Arrangements for carrying or protecting transceivers
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/025—Re-forming glass sheets by bending by gravity
- C03B23/0252—Re-forming glass sheets by bending by gravity by gravity only, e.g. sagging
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
- C03B23/0302—Re-forming glass sheets by bending by press-bending between shaping moulds between opposing full-face shaping moulds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/2419—Fold at edge
- Y10T428/24264—Particular fold structure [e.g., beveled, etc.]
Definitions
- This invention relates to mobile-display cover glasses and methods for manufacturing the same.
- Mobile devices with a display including cellular phones, smartphones, notebook personal computers, and tablet personal computers, have recently been widely used (hereinafter, a mobile device with a display is referred to as a "mobile display").
- Patent Literature 1 describes a cover glass that can be used for a mobile display.
- the cover glass described in Patent Literature 1 includes: a front portion located in front of an image display region; and bent portions located at both sides of the image display region in a width direction thereof and bending away from the front portion.
- Such a cover glass for a mobile display is required to be less susceptible to damage from impact caused upon dropping of the mobile display.
- a principal object of the present invention is to provide a mobile-display cover glass less susceptible to damage from impact caused upon dropping of a mobile display.
- the mobile-display cover glass according to the present invention is a mobile-display cover glass configured to cover a display region and at least a portion of a side surface of a mobile display.
- the mobile-display cover glass according to the present invention includes a flat sheet-like front portion and a side portion.
- the front portion is configured to be disposed in front of the display region.
- the front portion extends in a first direction and a second direction perpendicular to the first direction.
- the side portion is configured to be disposed lateral to the mobile display.
- the side portion includes a bent portion. The bent portion bends backward from one end of the front portion in the first direction. A corner of the side portion has a rounded shape.
- L 1 >L 2 is preferably satisfied where L 1 represents a length of the side portion at a part thereof other than the corner, the length running from a starting point of the bending of the bent portion to an end of the side portion and measured along an outside surface of the side portion, and L 2 represents a length of the corner having a rounded shape, the length being measured on the outside surface of the side portion along the second direction.
- the contour of the corner having a rounded shape may have an arcuate shape having a radius of curvature of 0.1 mm to 5.0 mm.
- the mobile-display cover glass according to the present invention preferably has a thickness within a range of 0.2 mm to 1.5 mm.
- L 3 >L 2 may be satisfied where L 2 represents a length of the corner having a rounded shape, measured on the outside surface of the side portion along the second direction, and L 3 represents a length of the corner having a rounded shape, measured on the outside surface of the side portion along the first direction.
- the corner having a rounded shape may have an elliptically arcuate contour having a major axis parallel to the first direction in development view.
- a method for manufacturing a mobile-display cover glass according to the present invention relates to a method for manufacturing the mobile-display cover glass according to the present invention.
- a rectangular flat glass sheet having a corner of a rounded shape is prepared.
- the flat glass sheet is placed on a forming die having a flat forming surface so that a middle portion of the flat glass sheet in one direction is located on the forming surface and an end portion of the flat glass sheet in the one direction is located outside the forming surface.
- the end portion of the flat glass sheet is pressed down with the application of heat to form the front portion and the side portion.
- the present invention can provide a mobile-display cover glass less susceptible to damage from impact caused upon dropping of a mobile display.
- Fig. 1 is a schematic perspective view of a mobile-display cover glass according to this embodiment.
- Fig. 2 is a schematic front view of the mobile-display cover glass according to this embodiment.
- Fig. 3 is a schematic side view of the mobile-display cover glass according to this embodiment.
- Fig. 4 is an enlarged schematic front view of a portion of the mobile-display cover glass according to this embodiment.
- Fig. 5 is an enlarged schematic side view of a portion of the mobile-display cover glass according to this embodiment.
- the mobile-display cover glass 1 shown in Figs. 1 to 5 is, as shown in Fig. 2 , a cover glass configured to cover a display region 2a and at least portions of side surfaces 2b of a mobile display 2 (see Figs. 2 and 3 ). More specifically, the mobile-display cover glass 1 is a cover glass configured to cover the display region 2a of the mobile display 2 and at least portions of both side surfaces thereof in the x-axis direction. No particular limitation is placed on the type of the mobile display 2 so long as it is a mobile device equipped with a display.
- the mobile display 2 may be, for example, a cellular phone, a smartphone, a notebook personal computer, a tablet personal computer or the like.
- the mobile display 2 may be in a plate-like shape.
- the mobile-display cover glass 1 is preferably made of, for example, a tempered glass such as a chemically tempered glass, a crystallized glass or the like.
- the thickness of the mobile-display cover glass 1 is not necessarily limited but is preferably 0.2 mm to 1.5 mm, more preferably 0.25 mm to 1.1 mm, and still more preferably 0.3 mm to 1.0 mm.
- the mobile-display cover glass 1 includes a front portion 11.
- the front portion 11 is a portion to be disposed in front (on a z1 side) of the display region 2a of the mobile display 2.
- the term "in front of” herein refers to a direction of extension of the normal of the display region 2a and the opposite side to the direction of extension of the normal is referred to as backward.
- the front portion 11 has a flat sheet-like shape.
- the front portion 11 extends in the x-axis direction and the y-axis direction perpendicular to the x-axis direction.
- the front portion 11 has a rectangular shape.
- the dimension of the front portion 11 along the x-axis direction may be, for example, about 40 mm to about 200 mm.
- the dimension of the front portion 11 along the y-axis direction may be, for example, about 80 mm to about 300 mm.
- the term "flat sheet-like shape” includes a substantially flat sheet-like shape.
- the term "flat sheet” includes a sheet having one surface and the other surface inclined at 5° or less with respect to the one surface.
- This first side portion 12 is a portion to be disposed lateral to the mobile display 2. Specifically, the first side portion 12 is disposed on an x1 side of the mobile display 2 in the x-axis direction.
- the first side portion 12 includes a first bent portion 12a.
- the first bent portion 12a bends backward (toward a z2 side) from the x1-side end of the front portion 11 in the x-axis direction.
- a bending angle ⁇ (see Fig. 2 ), the angle formed by the tangent line of the inside wall surface of the x1-side end of the front portion 11 and the tangent line of the inside wall surface of the distal end of the first side portion 12, is preferably 90° to 170°, more preferably 90° to 160°, and still more preferably 90° to 150°.
- the first side portion 12 includes the first bent portion 12a and a first flat portion 12b connected to an end of the first bent portion 12a.
- the first side portion 12 may be composed of the first bent portion 12a alone.
- An x2-side end of the front portion 11 in the x-axis direction is connected to a second side portion 13.
- This second side portion 13, the front portion 11, and the first side portion 12 are formed of a single glass sheet.
- the second side portion 13 is a portion to be disposed lateral to the mobile display 2. Specifically, the second side portion 13 is disposed on an x2 side of the mobile display 2 in the x-axis direction.
- the second side portion 13 includes a second bent portion 13a.
- the second bent portion 13a bends backward (toward the z2 side) from the x2-side end of the front portion 11 in the x-axis direction.
- the bending angle ( ⁇ ) between the front portion 11 and the second side portion 13 is preferably 90° to 170°, more preferably 90° to 160°, and still more preferably 90° to 150°.
- the second side portion 13 includes the second bent portion 13a and a second flat portion 13b connected to an end of the second bent portion 13a.
- the present invention is not limited to this configuration.
- the second side portion 13 may be composed of the second bent portion 13a alone.
- the corners of the side portions are provided to have a right angle.
- the corners of the side portions do not have a rounded shape.
- the reason for this is that if the corners of the side portions are attempted to be formed in a rounded shape, a flat glass sheet must be deformed by softening, which makes it difficult to produce a cover glass.
- the corners of the side portions are provided to have a right angle, the mobile-display cover glass is susceptible to damage when a mobile display with the mobile-display cover glass attached thereto drops and thus any corner of the mobile display hits the ground.
- the corners 12c, 13c of the side portions 12, 13 have a rounded shape.
- the corners 12c, 13c of the side portions 12, 13 are provided in a round chamfered shape. Therefore, even if the mobile display 2 with the mobile-display cover glass 1 attached thereto drops and any corner of the mobile display 2 hits the ground, impact upon hitting the ground is less likely to propagate to the corner 12c, 13c of the side portion 12, 13 and therefore the mobile-display cover glass 1 is less susceptible to damage.
- the contour of the corners 12c, 13c of the side portions 12, 13 preferably has an arcuate shape and more preferably has an arcuate shape with a radius of curvature of not less than 0.1 mm and an arcuate shape with a radius of curvature of not more than 5.0 mm.
- the mobile-display cover glass 1 can be manufactured by, for example, the following manufacturing method.
- a flat glass sheet 20 shown in Fig. 6 is prepared.
- the flat glass sheet 20 is a glass sheet for use to constitute a mobile-display cover glass 1.
- Each of four corners of the flat glass sheet 20 is for use to constitute one corner of the side portions 12, 13. Therefore, each of the four corners of the flat glass sheet 20 has a rounded shape.
- the thickness of the flat glass sheet 20 is substantially equal to that of the mobile-display cover glass 1.
- This flat glass sheet 20 is formed into a mobile-display cover glass 1 using a forming apparatus 30.
- the forming apparatus 30 includes a forming chamber 33.
- the forming chamber 33 is internally provided with a heater 41.
- the heater 41 radiates heat rays. Therefore, the forming apparatus 30 can radiationally heat an object placed in the forming chamber 33.
- First and second heat-insulating members 31, 32 having their respective flat forming surfaces 31b, 32b are disposed in the forming chamber 33.
- the first and second heat-insulating members 31, 32 are members that have a function as a forming die and are configured to reduce the transfer of radiation heat to the flat glass sheet 20.
- the first and second heat-insulating members 31, 32 preferably have a lower thermal conductivity than the flat glass sheet 20.
- the first and second heat-insulating members 31, 32 preferably block heat rays emitted from the heater 41.
- the first and second heat-insulating members 31, 32 can be formed of, for example, ceramic material containing as a major ingredient alumina, silicon carbide or diatomite.
- Each of the heat-insulating members 31, 32 includes at least one through hole 31a, 32a.
- a coolant, such as air, is fed through these through holes 31a, 32a during heating and forming.
- the temperature of the heat-insulating members 31, 32 can be controlled. For example, an undesirable temperature rise of the heat-insulating members 31, 32 can be prevented.
- the flat glass sheet 20 is placed so that a first portion 21 of the flat glass sheet 20, which is a middle portion thereof in one direction, is located on the forming surface 32b of the second heat-insulating member 32 and second portions 22a, 22b of the flat glass sheet 20, which are end portions thereof in the one direction, are located outside the forming surface 32b. Thereafter, the first heat-insulating member 31 is put on the first portion 21 of the flat glass sheet 20. Thus, the first portion 21 is held between the first and second heat-insulating members 31, 32. The second portions 22a, 22b are not held between the first and second heat-insulating members 31, 32.
- the heater 41 is actuated to radiationally heat the flat glass sheet 20 (heating step).
- the second portions 22a, 22b are bent by pressing them downward using pressing tools 51, 52 provided on both sides of the first and second heat-insulating members 31, 32 (forming step).
- a front portion 11 is formed from the first portion 21 and side portions 12, 13 are formed from the second portions 22a, 22b, thereby obtaining a mobile-display cover glass 1.
- the forming may be performed using the second heat-insulating member 32 and the pressing tools 51, 52 without provision of the first heat-insulating member 31.
- the side portions 12, 13 are formed by pressing the ends of the second portions 22a, 22b using the pressing tools 51, 52 as described above, since the corners of the second portions 22a, 22b have a rounded shape, the corners are not directly pressed by the pressing tools 51, 52. Furthermore, the length of each second portion 22a, 22b along the x-axis direction is shorter at both ends thereof in the y-axis direction than at the other portion thereof. Therefore, the ends of each bent portion 12a, 13a in the y-axis direction are likely to have a greater radius of curvature than the other portion thereof. This makes it difficult to obtain a mobile-display cover glass 1 having a high shape accuracy.
- L 2 is equal to the radius of curvature of the contour of the corners of the second portions 22a, 22b.
- the relation L 1 ⁇ (3/2) ⁇ L 2 is preferably satisfied and the relation L 1 ⁇ (2/1) ⁇ L 2 is more preferably satisfied.
- the radius of curvature of the corners 12c, 13c is preferably less than L 1 , more preferably not more than 2/3 times as much as L 1 , and still more preferably not more than 1/2 times as much as L 1 .
- the radius of curvature of the corners 12c, 13c is preferably not more than the height of the side portion 12, 13 in side view (when viewed from the x-axis direction), more preferably not more than 2/3 times the height of the side portion 12, 13 in side view, and still more preferably not more than 1/2 times the height of the side portion 12, 13 in side view.
- the radius of curvature of the corners 12c, 13c of the side portions 12, 13 is preferably not more than 5 mm and more preferably not more than 3 mm.
- the resistance to impact upon dropping may be low.
- the radius of curvature of the corners 12c, 13c of the side portions 12, 13 is preferably not less than 0.1 mm, more preferably not less than 0.2 mm, still more preferably not less than 0.3 mm, and yet still more preferably not less than 0.5 mm.
- L 1 is smaller, the problem is more likely to arise that a mobile-display cover glass 1 having a higher shape accuracy is difficult to obtain. Therefore, when L 1 is not more than 5.0 mm and particularly not more than 3.0 mm, it is more effective to provide the corners 12c, 13c of the side portions 12, 13 to satisfy the relation L 1 >L 2 . Although no particular limitation is placed on the lower limit of L 1 , it is generally about 2.0 mm.
- the bending angle ⁇ is not more than 120° and particularly not more than 100°, it is more effective to provide the corners 12c, 13c of the side portions 12, 13 to satisfy the relation L 1 >L 2 .
- the lower limit of the bending angle ⁇ it is generally about 90°.
- the contour of the corners 12c, 13c of the side portions 12, 13 has an arcuate shape.
- the side portions 12, 13 may have a shape that satisfies the relation L 3 >L 2 where L 3 represents the length (mm) of the corner 12c, 13c having a rounded shape, measured on the outside surface of the side portion 12, 13 along the x-axis direction.
- the contour of the corners 12c, 13c of a rounded shape of the side portions 12, 13 may have an elliptically arcuate shape having a major axis parallel to the x-axis direction in development view.
- portions of the flat portions 12b, 13b closer to the ends thereof in the y-axis direction can be pressed by the pressing tools 51, 52. Therefore, a mobile-display cover glass 1 having a higher shape accuracy can be obtained.
- the relation L 3 ⁇ (3/2) ⁇ L 2 is preferably satisfied and the relation L 3 ⁇ (2/1) ⁇ L 2 is more preferably satisfied.
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Abstract
Description
- This invention relates to mobile-display cover glasses and methods for manufacturing the same.
- Mobile devices with a display, including cellular phones, smartphones, notebook personal computers, and tablet personal computers, have recently been widely used (hereinafter, a mobile device with a display is referred to as a "mobile display").
-
Patent Literature 1 describes a cover glass that can be used for a mobile display. The cover glass described inPatent Literature 1 includes: a front portion located in front of an image display region; and bent portions located at both sides of the image display region in a width direction thereof and bending away from the front portion. - [PTL 1]
JP-A-2012-101975 - Such a cover glass for a mobile display is required to be less susceptible to damage from impact caused upon dropping of the mobile display.
- A principal object of the present invention is to provide a mobile-display cover glass less susceptible to damage from impact caused upon dropping of a mobile display.
- The mobile-display cover glass according to the present invention is a mobile-display cover glass configured to cover a display region and at least a portion of a side surface of a mobile display. The mobile-display cover glass according to the present invention includes a flat sheet-like front portion and a side portion. The front portion is configured to be disposed in front of the display region. The front portion extends in a first direction and a second direction perpendicular to the first direction. The side portion is configured to be disposed lateral to the mobile display. The side portion includes a bent portion. The bent portion bends backward from one end of the front portion in the first direction. A corner of the side portion has a rounded shape.
- When the corner having a rounded shape has an arcuate contour, the relation L1>L2 is preferably satisfied where L1 represents a length of the side portion at a part thereof other than the corner, the length running from a starting point of the bending of the bent portion to an end of the side portion and measured along an outside surface of the side portion, and L2 represents a length of the corner having a rounded shape, the length being measured on the outside surface of the side portion along the second direction.
- It is more preferred that the relation L1≥(3/2)·L2 be satisfied.
- The contour of the corner having a rounded shape may have an arcuate shape having a radius of curvature of 0.1 mm to 5.0 mm.
- The mobile-display cover glass according to the present invention preferably has a thickness within a range of 0.2 mm to 1.5 mm.
- The relation L3>L2 may be satisfied where L2 represents a length of the corner having a rounded shape, measured on the outside surface of the side portion along the second direction, and L3 represents a length of the corner having a rounded shape, measured on the outside surface of the side portion along the first direction.
- The corner having a rounded shape may have an elliptically arcuate contour having a major axis parallel to the first direction in development view.
- A method for manufacturing a mobile-display cover glass according to the present invention relates to a method for manufacturing the mobile-display cover glass according to the present invention. In the method for manufacturing the mobile-display cover glass according to the present invention, a rectangular flat glass sheet having a corner of a rounded shape is prepared. The flat glass sheet is placed on a forming die having a flat forming surface so that a middle portion of the flat glass sheet in one direction is located on the forming surface and an end portion of the flat glass sheet in the one direction is located outside the forming surface. The end portion of the flat glass sheet is pressed down with the application of heat to form the front portion and the side portion.
- The present invention can provide a mobile-display cover glass less susceptible to damage from impact caused upon dropping of a mobile display.
-
- [
Fig. 1 ]
Fig. 1 is a schematic perspective view of a mobile-display cover glass according to one embodiment of the present invention. - [
Fig. 2 ]
Fig. 2 is a schematic front view of the mobile-display cover glass according to the one embodiment of the present invention. - [
Fig. 3 ]
Fig. 3 is a schematic side view of the mobile-display cover glass according to the one embodiment of the present invention. - [
Fig. 4 ]
Fig. 4 is an enlarged schematic front view of a portion of the mobile-display cover glass according to the one embodiment of the present invention. - [
Fig. 5 ]
Fig. 5 is an enlarged schematic side view of a portion of the mobile-display cover glass according to the one embodiment of the present invention. - [
Fig. 6 ]
Fig. 6 is a schematic cross-sectional view for illustrating a manufacturing step for the mobile-display cover glass in the one embodiment of the present invention. - [
Fig. 7 ]
Fig. 7 is a schematic cross-sectional view for illustrating another manufacturing step for the mobile-display cover glass in the one embodiment of the present invention. - [
Fig. 8 ]
Fig. 8 is an enlarged schematic side view of a portion of a mobile-display cover glass according to a modification. - Hereinafter, a description will be given of an exemplary preferred embodiment for working of the present invention. However, the following embodiment is simply illustrative. The present invention is not at all limited to the following embodiment.
- Throughout the drawings to which the embodiment and the like refer, elements having substantially the same functions will be referred to by the same reference signs. The drawings to which the embodiment and the like refer are schematically illustrated. The dimensional ratios and the like of objects illustrated in the drawings may be different from those of the actual objects. Different drawings may have different dimensional ratios and the like of the objects. Dimensional ratios and the like of specific objects should be determined in consideration of the following descriptions.
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Fig. 1 is a schematic perspective view of a mobile-display cover glass according to this embodiment.Fig. 2 is a schematic front view of the mobile-display cover glass according to this embodiment.Fig. 3 is a schematic side view of the mobile-display cover glass according to this embodiment.Fig. 4 is an enlarged schematic front view of a portion of the mobile-display cover glass according to this embodiment.Fig. 5 is an enlarged schematic side view of a portion of the mobile-display cover glass according to this embodiment. - The mobile-
display cover glass 1 shown inFigs. 1 to 5 is, as shown inFig. 2 , a cover glass configured to cover adisplay region 2a and at least portions ofside surfaces 2b of a mobile display 2 (seeFigs. 2 and3 ). More specifically, the mobile-display cover glass 1 is a cover glass configured to cover thedisplay region 2a of themobile display 2 and at least portions of both side surfaces thereof in the x-axis direction. No particular limitation is placed on the type of themobile display 2 so long as it is a mobile device equipped with a display. Themobile display 2 may be, for example, a cellular phone, a smartphone, a notebook personal computer, a tablet personal computer or the like. Themobile display 2 may be in a plate-like shape. - The mobile-
display cover glass 1 is preferably made of, for example, a tempered glass such as a chemically tempered glass, a crystallized glass or the like. - The thickness of the mobile-
display cover glass 1 is not necessarily limited but is preferably 0.2 mm to 1.5 mm, more preferably 0.25 mm to 1.1 mm, and still more preferably 0.3 mm to 1.0 mm. - The mobile-
display cover glass 1 includes afront portion 11. Thefront portion 11 is a portion to be disposed in front (on a z1 side) of thedisplay region 2a of themobile display 2. The term "in front of" herein refers to a direction of extension of the normal of thedisplay region 2a and the opposite side to the direction of extension of the normal is referred to as backward. - The
front portion 11 has a flat sheet-like shape. Thefront portion 11 extends in the x-axis direction and the y-axis direction perpendicular to the x-axis direction. Thefront portion 11 has a rectangular shape. The dimension of thefront portion 11 along the x-axis direction may be, for example, about 40 mm to about 200 mm. The dimension of thefront portion 11 along the y-axis direction may be, for example, about 80 mm to about 300 mm. The term "flat sheet-like shape" includes a substantially flat sheet-like shape. For example, the term "flat sheet" includes a sheet having one surface and the other surface inclined at 5° or less with respect to the one surface. - An x1-side end of the
front portion 11 in the x-axis direction is connected to afirst side portion 12. Thisfirst side portion 12 is a portion to be disposed lateral to themobile display 2. Specifically, thefirst side portion 12 is disposed on an x1 side of themobile display 2 in the x-axis direction. - The
first side portion 12 includes a firstbent portion 12a. The firstbent portion 12a bends backward (toward a z2 side) from the x1-side end of thefront portion 11 in the x-axis direction. A bending angle θ (seeFig. 2 ), the angle formed by the tangent line of the inside wall surface of the x1-side end of thefront portion 11 and the tangent line of the inside wall surface of the distal end of thefirst side portion 12, is preferably 90° to 170°, more preferably 90° to 160°, and still more preferably 90° to 150°. - Particularly in this embodiment, the
first side portion 12 includes the firstbent portion 12a and a firstflat portion 12b connected to an end of the firstbent portion 12a. However, the present invention is not limited to this configuration. Thefirst side portion 12 may be composed of the firstbent portion 12a alone. - An x2-side end of the
front portion 11 in the x-axis direction is connected to asecond side portion 13. Thissecond side portion 13, thefront portion 11, and thefirst side portion 12 are formed of a single glass sheet. Thesecond side portion 13 is a portion to be disposed lateral to themobile display 2. Specifically, thesecond side portion 13 is disposed on an x2 side of themobile display 2 in the x-axis direction. - The
second side portion 13 includes a secondbent portion 13a. The secondbent portion 13a bends backward (toward the z2 side) from the x2-side end of thefront portion 11 in the x-axis direction. The bending angle (θ) between thefront portion 11 and thesecond side portion 13 is preferably 90° to 170°, more preferably 90° to 160°, and still more preferably 90° to 150°. - Particularly in this embodiment, the
second side portion 13 includes the secondbent portion 13a and a secondflat portion 13b connected to an end of the secondbent portion 13a. However, the present invention is not limited to this configuration. Thesecond side portion 13 may be composed of the secondbent portion 13a alone. - Generally, as also described in
Patent Literature 1, the corners of the side portions are provided to have a right angle. In other words, the corners of the side portions do not have a rounded shape. The reason for this is that if the corners of the side portions are attempted to be formed in a rounded shape, a flat glass sheet must be deformed by softening, which makes it difficult to produce a cover glass. On the other hand, if the corners of the side portions are provided to have a right angle, the mobile-display cover glass is susceptible to damage when a mobile display with the mobile-display cover glass attached thereto drops and thus any corner of the mobile display hits the ground. - In contrast, in the mobile-
display cover glass 1, thecorners side portions corners side portions mobile display 2 with the mobile-display cover glass 1 attached thereto drops and any corner of themobile display 2 hits the ground, impact upon hitting the ground is less likely to propagate to thecorner side portion display cover glass 1 is less susceptible to damage. - From the viewpoint of more effectively reducing the damage of the mobile-
display cover glass 1 upon dropping, the contour of thecorners side portions - No particular limitation is placed on the method for manufacturing the mobile-
display cover glass 1. The mobile-display cover glass 1 can be manufactured by, for example, the following manufacturing method. - First, a
flat glass sheet 20 shown inFig. 6 is prepared. Theflat glass sheet 20 is a glass sheet for use to constitute a mobile-display cover glass 1. Each of four corners of theflat glass sheet 20 is for use to constitute one corner of theside portions flat glass sheet 20 has a rounded shape. The thickness of theflat glass sheet 20 is substantially equal to that of the mobile-display cover glass 1. Thisflat glass sheet 20 is formed into a mobile-display cover glass 1 using a formingapparatus 30. - The forming
apparatus 30 includes a formingchamber 33. The formingchamber 33 is internally provided with aheater 41. Theheater 41 radiates heat rays. Therefore, the formingapparatus 30 can radiationally heat an object placed in the formingchamber 33. - First and second heat-insulating
members surfaces chamber 33. The first and second heat-insulatingmembers flat glass sheet 20. The first and second heat-insulatingmembers flat glass sheet 20. Furthermore, the first and second heat-insulatingmembers heater 41. The first and second heat-insulatingmembers - Each of the heat-insulating
members hole holes members members - In forming the
flat glass sheet 20, first, theflat glass sheet 20 is placed so that afirst portion 21 of theflat glass sheet 20, which is a middle portion thereof in one direction, is located on the formingsurface 32b of the second heat-insulatingmember 32 andsecond portions flat glass sheet 20, which are end portions thereof in the one direction, are located outside the formingsurface 32b. Thereafter, the first heat-insulatingmember 31 is put on thefirst portion 21 of theflat glass sheet 20. Thus, thefirst portion 21 is held between the first and second heat-insulatingmembers second portions members - Next, with the
first portion 21 of theflat glass sheet 20 held between the first and second heat-insulatingmembers heater 41 is actuated to radiationally heat the flat glass sheet 20 (heating step). - And then, as shown in
Fig. 7 , thesecond portions pressing tools members 31, 32 (forming step). Thus, afront portion 11 is formed from thefirst portion 21 andside portions second portions display cover glass 1. - The forming may be performed using the second heat-insulating
member 32 and thepressing tools member 31. - If the
side portions second portions pressing tools second portions pressing tools second portion bent portion display cover glass 1 having a high shape accuracy. - In view of the above, when the contour of the corners of the
second portions - the relation L1>L2 is preferably satisfied
where - L1 represents the length (mm) of each
side portion corners end surface 13e and measured along the outside surface of theside portion 12, 13 (seeFig. 4 ), and - L2 represents the length (mm) of the
corner side portion Fig. 5 ). - When the contour of the corners of the
second portions second portions - From the viewpoint of achieving a higher shape accuracy, the relation L1≥(3/2)·L2 is preferably satisfied and the relation L1≥ (2/1) ·L2 is more preferably satisfied. When the contour of the
corners side portions corners corners side portion side portion side portion corners side portions corners side portions corners side portions - As L1 is smaller, the problem is more likely to arise that a mobile-
display cover glass 1 having a higher shape accuracy is difficult to obtain. Therefore, when L1 is not more than 5.0 mm and particularly not more than 3.0 mm, it is more effective to provide thecorners side portions - Also, as the bending angle θ is smaller, the problem is more likely to arise that a mobile-
display cover glass 1 having a higher shape accuracy is difficult to obtain. Therefore, when the bending angle θ is not more than 120° and particularly not more than 100°, it is more effective to provide thecorners side portions - In this embodiment, an example has been described in which the contour of the
corners side portions Fig. 8 , theside portions corner side portion corners side portions pressing tools flat portions pressing tools display cover glass 1 having a higher shape accuracy can be obtained. From the viewpoint of achieving a still higher shape accuracy, the relation L3≥(3/2)·L2 is preferably satisfied and the relation L3≥(2/1)·L2 is more preferably satisfied. -
- 1
- mobile-display cover glass
- 2
- mobile display
- 2a
- display region
- 2b
- side surface
- 11
- front portion
- 12
- first side portion
- 12a
- first bent portion
- 12b
- first flat portion
- 12c
- corner
- 13
- second side portion
- 13a
- second bent portion
- 13b
- second flat portion
- 13c
- corner
- 13d
- starting point of bending
- 13e
- end surface
- 20
- flat glass sheet
- 21
- first portion
- 22a, 22b
- second portion
- 30
- forming apparatus
- 31, 32
- heat-insulating member
- 31a, 32a
- through hole
- 31b, 32b
- forming surface
- 33
- forming chamber
- 41
- heater
- 51, 523
- pressing tool
Claims (8)
- A mobile-display cover glass configured to cover a display region and at least a portion of a side surface of a mobile display, the mobile-display cover glass comprising:a flat sheet-like front portion configured to be disposed in front of the display region and extending in a first direction and a second direction perpendicular to the first direction; anda side portion configured to be disposed lateral to the mobile display and including a bent portion bending backward from one end of the front portion in the first direction,wherein a corner of the side portion has a rounded shape.
- The mobile-display cover glass according to claim 1, wherein
the corner having a rounded shape has an arcuate contour, and
the relation L1>L2 is satisfied where
L1 represents a length of the side portion at a part thereof other than the corner, the length running from a starting point of the bending of the bent portion to an end of the side portion and measured along an outside surface of the side portion, and
L2 represents a length of the corner having a rounded shape, the length being measured on the outside surface of the side portion along the second direction. - The mobile-display cover glass according to claim 2, wherein the relation L1≥(3/2)·L2 is satisfied.
- The mobile-display cover glass according to claim 2 or 3, wherein the contour of the corner having a rounded shape has an arcuate shape having a radius of curvature of 0.1 mm to 5.0 mm.
- The mobile-display cover glass according to any one of claims 1 to 4, having a thickness within a range of 0.2 mm to 1.5 mm.
- The mobile-display cover glass according to any one of claims 1 to 5, wherein the relation L3>L2 is satisfied where
L2 represents a length of the corner having a rounded shape, measured on the outside surface of the side portion along the second direction, and
L3 represents a length of the corner having a rounded shape, measured on the outside surface of the side portion along the first direction. - The mobile-display cover glass according to claim 6, wherein the corner having a rounded shape has an elliptically arcuate contour having a major axis parallel to the first direction in development view.
- A method for manufacturing the mobile-display cover glass according to any one of claims 1 to 7, the method comprising the steps of:preparing a rectangular flat glass sheet having a corner of a rounded shape;placing the flat glass sheet on a forming die having a flat forming surface so that a middle portion of the flat glass sheet in one direction is located on the forming surface and an end portion of the flat glass sheet in the one direction is located outside the forming surface; andpressing down the end portion of the flat glass sheet with the application of heat to form the front portion and the side portion.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012224825 | 2012-10-10 | ||
JP2013158498A JP5472521B1 (en) | 2012-10-10 | 2013-07-31 | Manufacturing method of cover glass for mobile display |
PCT/JP2013/075893 WO2014057805A1 (en) | 2012-10-10 | 2013-09-25 | Mobile-display cover glass and method for manufacturing same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2908306A1 true EP2908306A1 (en) | 2015-08-19 |
EP2908306A4 EP2908306A4 (en) | 2016-06-22 |
Family
ID=50477276
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13846184.3A Withdrawn EP2908306A4 (en) | 2012-10-10 | 2013-09-25 | Mobile-display cover glass and method for manufacturing same |
Country Status (7)
Country | Link |
---|---|
US (1) | US9701562B2 (en) |
EP (1) | EP2908306A4 (en) |
JP (1) | JP5472521B1 (en) |
KR (1) | KR102087181B1 (en) |
CN (1) | CN104704545B (en) |
TW (1) | TWI598306B (en) |
WO (1) | WO2014057805A1 (en) |
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- 2013-07-31 JP JP2013158498A patent/JP5472521B1/en not_active Expired - Fee Related
- 2013-08-07 TW TW102128369A patent/TWI598306B/en not_active IP Right Cessation
- 2013-09-25 CN CN201380053122.0A patent/CN104704545B/en not_active Expired - Fee Related
- 2013-09-25 EP EP13846184.3A patent/EP2908306A4/en not_active Withdrawn
- 2013-09-25 WO PCT/JP2013/075893 patent/WO2014057805A1/en active Application Filing
- 2013-09-25 KR KR1020157008934A patent/KR102087181B1/en active IP Right Grant
- 2013-09-25 US US14/423,233 patent/US9701562B2/en active Active
Also Published As
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KR20150067178A (en) | 2015-06-17 |
US20150251943A1 (en) | 2015-09-10 |
CN104704545B (en) | 2017-08-25 |
TW201414681A (en) | 2014-04-16 |
KR102087181B1 (en) | 2020-03-10 |
US9701562B2 (en) | 2017-07-11 |
JP2014095886A (en) | 2014-05-22 |
JP5472521B1 (en) | 2014-04-16 |
EP2908306A4 (en) | 2016-06-22 |
CN104704545A (en) | 2015-06-10 |
WO2014057805A1 (en) | 2014-04-17 |
TWI598306B (en) | 2017-09-11 |
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